How to avoid background ruining crossfade transition?

This is pre-crossfade

This is midcrossfade

The background image shows very clearly through and ruins the transition completely, changing lighting, etc.
How to avoid that? thank you.

I tried putting a black square under it but now its the black square showing through. Is there a way to “cut out” the middle of the backround video or something?

EDIT: OK SOLVED IT, it’s a real haggard solution but it works. Shouldn’t be like this I think.

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With the filter: Alpha Channel: Adjust set to Threshold mode.


Without the filter.